高磷鲕状赤铁矿煤基直接还原实验

Experiment of coal-based direct reduction of high phosphorus oolitic hematite

采用XRD和SEM对高磷鲕状赤铁矿矿物的组成及矿相结构进行了研究分析,根据分析结果提出采用煤基直接还原-磁选工艺处理高磷鲕状赤铁矿,并对影响该工艺的因素进行了详细的实验研究与分析。结果表明:最佳工艺条件为还原温度1 250℃、还原时间30min、碳氧比1.8及碱度0.8,在此工艺条件下,可以得到产率为47.68%、铁品位为86.51%、铁回收率为92.94%、磷的质量分数为0.18%和金属化率为92.56%的磁选精矿以及磷回收率为92.88%的尾矿。

The coal-based direct reduction-magnetic separation was adopted to deal with the high phosphorus oolitic hematite after the mineral composition and structure of this ore were identified by XRD and SEM, and the factors which effected the process were studied and analyzed. The results show that the optimum process condition is tem- perature of 1 250 ℃, time of 30 min, carbon/oxygen ratio of 1.8 and basicity of 0.8, under this condition , the magnetic concentrate yield is 47.68 %, concentrate grade is 86.51%, recovery rate of iron is 92.94%, phosphorus content is 0.18 % and metallization rate is 92.56%, the recovery rate of phosphorus of tailing is 92.88%.